The graphic shows the island of Krakatoa, which disintegrated in 1889 due to the largest volcanic eruption in recorded history. In the century since the eruption, the island has re-formed from lava flows. The table above shows the number of species of various
plant types that were found on the island over a 30 year period since the island re-surfaced above the ocean in the 1950's.
Describe the relationship between moss and large trees.
A)
Large trees out-competed moss for sunlight and water directly after the
lava-flow.
B)
Mosses help to outcompete small trees, helping the large trees to grow.
Mosses were out-competed by other plants, and not directly by large trees.
D)
There is no relationship between moss and large trees, because plants
make their own food and do not depend on other plants.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.